A 10.0-ml solution of 0.780 M NH₃ is titrated with a 0.260 M HCL solution. calculate the pH after the following additions of the hcl solution:

A. 0.00

B. 10.0

C. 30.0

D. 40.0

briefly describe the theory of gas chromatography and the function of a basic gas chromatogram?

What mass of dichloromethane (CH₂Cl₂) should be dissolved 20.9 moles of dihydrogen monoxide (H₂O) for the resulting solution to have a freezing point of -0.0183 degrees Celcius? The freezing point of pure dihydrogen monoxide is 0.00 degrees Celcius and K_f = 1.86 degrees Celcius/m.

5. In the titration of 15.00 mL of a 0.1000 M acetic acid solution by a 0.1000 M NaOH solution, find the pH of the solution being titrated when

a) 0.00 mL of NaOH has been added

b) 5.00 mL of NaOH has been added

c) 7.50 mL of NaOH has been added

d) 14.90 mL of NaOH has been added

e) 15.00 mL of NaOH has been added

f) 30.00 mL of NaOH has been added

Chemistry: Calorimetry and Heats of Reaction

Mass of water in styrofoam cup: 100g

Mass of KCl: 1.650g

Initial Temperature: 20.6degC

Final Temperature: 19.6degC

q=(75g)(1.0 cal/g x degC)(-1degC)= -75cal

qreaction= -qcontents

-75 cal = 75 cal --> 0.075kCal

1.650g KCl = 0.2214 mol KCl

0.075kCal/0.02214mol = 3.39kCal mol KCl

Is this the standard heat of solution?

If this is the standard heat of solution, how would I determine the percent error of my result?

I was given this equation:

Percent error = |lit value - exptl value/lit value| x 100

with this information:

KCl(s) --> K+(g) + Cl-(g) dH=167.1kCal/mol

K+(g) + Cl-(g --> dH=163.0 kCal/mol

KCl(s) --> K+(aq) + Cl-(aq) dH=??

I know this question was super long. I'm sorry I'm confused and I'm not really sure where to begin.

Dinitrogen pentoxide (N2O5) decomposes in chloroform as a solvent to yield NO2 and O2. The decomposition is first order with a rate constant at 45 ∘C of 1.0×10−5s−1.

Calculate the partial pressure of O2 produced from 1.47 L of 0.605 M N2O5 solution at 45 ∘C over a period of 18.5 h if the gas is collected in a 11.4-L container. (Assume that the products do not dissolve in chloroform.)

A rocket took 300 days to travel 780,000,000 km. It carried 200. tons of propellant (density 0.986 g/mL

a) What is this in miles per hour?

b) Express the fule efficiency in miles per gallon.

Please write out the steps needed to calculate this. Thank you.

Three different blocks of Al, Cu, and Fe, each of them with a mass of 8.5 g, 4) absorb 0.845 kJ of heat at 25°C. The specific heats of Al, Cu, and Fe are 0.900 J/g·°C, 0.385J/g·°C, and 0.444 J/g·°C, respectively. a) Which block reaches the highest temperature? b) What is that temperature (in oC)?

The decomposition of N2O5 occurs with a rate constant of 4.3 x 10–3 sec–1 at 65C and 3.0 x 10–5 sec–1 at 25C. What is the activation energy of the process?

1. Consider the thermodynamics of the hypothetical process

H2O(l) --> ice-nine(s)

Based on the information above, will DG° for the formation of ice-nine from liquid water be positive or negative? Explain how you know.

Will the entropy, S°, for the system (the ocean) increase or decrease for this process? Explain how you know.

Based on your answers above, will the enthalpy change, DH°, for this process be positive or negative? Write a mathematical equation to support your answer.

Based on your answer to part c , will there be a change in the temperature of the ocean and its surroundings as the liquid water is converted to ice-nine? Explain.

Given that the melting point of ice-nine is much higher than that of regular ice, will the H° for the conversion of water to ice-nine be more positive or more negative than the H° for the conversion of water to regular ice? Explain.

A 1H 127I molecule, with a bond length of 160 pm, absorbed on the surface and rotates in two dimensions. A) Calculate the zero point energy associated with this rotation B) What is the smallest quantum energy that can be absorbed by this molecule in a rotational excitation?

Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.190 M HClO(aq) with 0.190 M KOH(aq).

a) before addition of any KOH

b) after addition of 25.0 mL of KOH

c) after addition of 35.0 mL of KOH

d) after addition of 50.0 mL of KOH

e) after addition of 60.0 mL of KOH

A student is working on the separation of a three-compound mixture, consisting of a carboxylic acid, amine, and neutral compound, and starts by extracting the dichloromethane solution of the mixture with 10% NaHCO3 rather than 5% HCl. Assuming the student recognizes the error before proceeding further, would the student still be able to separate and identify the components of the mixture? Describe what changes would have to be made to the remainder of the procedure in order to do so.

The standard electrode use to reference all electrode potentials to is? A.chlorine/chloride B.Cu2+/copper C.proton/hydrogen D.Zn2+/zinc